Protect PDF with Password
Add a password to your PDF so only people with the password can open it.
Add an open-password to any PDF before you send it
Whether it's a salary slip, a client contract, a medical report, or a family document, encrypting the PDF with a password makes sure that only the person you share the key with can open the file — even if the email is forwarded, the attachment leaks, or the file is accidentally posted to a shared folder. Password protection is the simplest, most universal way to add a lock that every PDF reader respects.
When password protection makes sense
- Email attachments — payroll, HR, and finance documents sent over unsecured email
- Cloud sharing — files on Google Drive, Dropbox, or OneDrive that sit exposed if a link leaks
- Legal contracts — confidential drafts that only named parties should open
- Medical and health records — prescriptions, reports, insurance documents
- Identity proofs — PAN, Aadhaar, passport copies shared with landlords, brokers, institutions
Choosing a strong password
Use at least 10 characters with a mix of upper, lower, digits, and a symbol. Avoid names, dates, and dictionary words — every guessing attack starts there. A passphrase like BlueCoffee-River-42 is both memorable and tough to brute-force. Share the password through a different channel than the file itself — if you emailed the PDF, send the password over SMS or a call.
Protect vs Sign vs Flatten
Use Protect PDF when you want to restrict who can open the file. Use Sign PDF when you want to show you approved its contents. Use Flatten PDF when you want to stop recipients from editing a file they can already open. These are complementary, not alternatives.
How to use this tool
- Upload PDF.
- Type a strong password.
- Click Protect & Download.
Frequently asked questions
What encryption strength is used?
The tool applies PDF standard encryption. Every modern PDF reader (Adobe Acrobat, Apple Preview, Chrome, Edge, Foxit) can decrypt it once the password is entered.
What happens if I forget the password?
There's no recovery. PDF encryption is designed so nobody — including this tool — can unlock a file without the password. Keep a copy in a password manager.
Does it stop users from editing once they've opened it?
Not on its own. An open password restricts opening only. To prevent editing of an already-open PDF, run Flatten PDF first, then Protect with a password.
Can a PDF be protected with two passwords — one to open, one to edit?
PDF supports both (user and owner password). This tool sets an open password. For granular permissions you'll need a desktop editor.
How do I share the password safely?
Send the file and password through different channels — e.g. email the PDF and SMS the password, or use a password manager share link. Never include both in the same message.
Is my file uploaded?
No — encryption happens in your browser. The PDF and password never leave your device.